2008-11-01 猛犸山

Every day people come to soak in Hot Creek¹, a place to rest, created by geologic² unrest. Sudden geyser eruptions⁴, driven by heat from magma below the Earth surface, can change water temperatures so fast that going into the water is not recommended. But here in the eastern Sierra Mountains, few people have their minds on what's beneath their feet. The Town of Mammoth⁵ Lakes, California, and the resort known as Mammoth Mountain are major draws for those who love to play outdoors.

Dave Hill is a seismologist with the US Geological Survey. And he will tell you Mammoth Lakes’ shakes. Typically, several earthquakes of Magnitude 2 or less are recorded in the Mammoth Lakes region every day. It's not so much the quakes that concern Dave. It's the volcanic⁶ eruption³ they might foreshadow.

760,000 years ago, a catastrophic volcanic eruption spewed, approximately 600 cubic kilometers of pyroclastics. An underground magma chamber⁷ collapsed⁸, forming the crater⁹ known as the Long Valley Caldera. A younger line of domes¹⁰ and craters¹¹ that make up what is called the Inyo-Mono Craters Volcanic Chain, stretches north from Mammoth Mountain at the Caldera southwest rim¹². Eruptions from this valley of the volcanoes have left behind some geological wonders.

This is a young volcanic area. And some day you can see another eruption.

In May, 1980, one week after the eruption of Mount St. Helens, four strong Magnitude 6 earthquakes rocked the Long Valley Caldera. Yet it took a few years before the general public seemed to realize the volcanic hazard. While earthquakes are common precursors¹³ to volcanic eruptions, there were none. But the Long Valley Caldera was identified as resurgent, a growing magma-fed bulge¹⁴. Scientists are keeping a close eye on the slightest degree of movement.

We are trying to see if and when we measure distance change; if that's associated with volcanic activity.

The resort town not only lives with magma on the move, but puts it to good use. This power plant is run by water, naturally heated from below ground. There are recent signs of geologic disturbances¹⁵ and volcanic activity. In 1990, trees on Mammoth Mountain Volcano began dying. Since then, more than 150 acres of trees have been killed by large amounts of carbon dioxide that is released into the soil by magma, suffocating¹⁶ the tree roots.

No one doubts this volcanic system will erupt again. But seismologist Dave Hill says the persistent¹⁷ unrest from this youthful volcanic system has finally been put in perspective. Today the geology of the Long Valley Caldera is monitored by scientists, respected by residents, and admired and appreciated by everyone. The US GS has established procedures and a response plan to promptly¹⁸ alert the public well in advance of a possible eruption. But the chances of it happening in the coming years are very, very small.

1 creek   

n.小溪，小河，小湾

参考例句：

• He sprang through the creek.他跳过小河。
• People sunbathe in the nude on the rocks above the creek.人们在露出小溪的岩石上裸体晒日光浴。

2 geologic   

adj.地质的

参考例句：

• The Red Sea is a geologic continuation of the valley.红海就是一个峡谷在地质上的继续发展。
• Delineation of channels is the first step of geologic evaluation.勾划河道的轮廓是地质解译的第一步。

3 eruption   

n.火山爆发；（战争等）爆发；（疾病等）发作

参考例句：

• The temple was destroyed in the violent eruption of 1470 BC.庙宇在公元前1470年猛烈的火山爆发中摧毁了。
• The eruption of a volcano is spontaneous.火山的爆发是自发的。

4 eruptions   

n.喷发，爆发( eruption的名词复数 )

参考例句：

• There have been several volcanic eruptions this year. 今年火山爆发了好几次。 来自《简明英汉词典》
• Over 200 people have been killed by volcanic eruptions. 火山喷发已导致200多人丧生。 来自辞典例句

5 mammoth   

n.长毛象；adj.长毛象似的，巨大的

参考例句：

• You can only undertake mammoth changes if the finances are there.资金到位的情况下方可进行重大变革。
• Building the new railroad will be a mammoth job.修建那条新铁路将是一项巨大工程。

6 volcanic   

adj.火山的；象火山的；由火山引起的

参考例句：

• There have been several volcanic eruptions this year.今年火山爆发了好几次。
• Volcanic activity has created thermal springs and boiling mud pools.火山活动产生了温泉和沸腾的泥浆池。

7 chamber   

n.房间，寝室；会议厅；议院；会所

参考例句：

• For many,the dentist's surgery remains a torture chamber.对许多人来说，牙医的治疗室一直是间受刑室。
• The chamber was ablaze with light.会议厅里灯火辉煌。

8 collapsed   

adj.倒塌的

参考例句：

• Jack collapsed in agony on the floor. 杰克十分痛苦地瘫倒在地板上。
• The roof collapsed under the weight of snow. 房顶在雪的重压下突然坍塌下来。

9 crater   

n.火山口，弹坑

参考例句：

• With a telescope you can see the huge crater of Ve-suvius.用望远镜你能看到巨大的维苏威火山口。
• They came to the lip of a dead crater.他们来到了一个死火山口。

10 domes   

n.圆屋顶( dome的名词复数 )；像圆屋顶一样的东西；圆顶体育场

参考例句：

• The domes are circular or ovoid in cross-section. 穹丘的横断面为圆形或卵圆形。 来自辞典例句
• Parks. The facilities highlighted in text include sport complexes and fabric domes. 本书重点讲的设施包括运动场所和顶棚式结构。 来自互联网

11 craters   

n.火山口( crater的名词复数 )；弹坑等

参考例句：

• Small meteorites have left impact craters all over the planet's surface. 这个行星的表面布满了小块陨石留下的撞击坑。 来自《简明英汉词典》
• The battlefield was full of craters made by exploding shells. 战场上布满弹坑。 来自《现代英汉综合大词典》

12 rim   

n.(圆物的)边，轮缘；边界

参考例句：

• The water was even with the rim of the basin.盆里的水与盆边平齐了。
• She looked at him over the rim of her glass.她的目光越过玻璃杯的边沿看着他。

13 precursors   

n.先驱( precursor的名词复数 )；先行者；先兆；初期形式

参考例句：

• Phenyl (or polyphenyl) substituted epoxides serve as excellent precursors to phenyl (or diphenyl) carbenes. 某些苯代（或多苯）环氧乙烷是制取带苯环（或二苯）碳烯的极好原料。 来自辞典例句
• Note the presence of megakaryocytes, erythroid islands, and granulocytic precursors. 可见巨核细胞，红细胞岛和粒细胞前体细胞。 来自互联网

14 bulge   

n.突出，膨胀，激增；vt.突出，膨胀

参考例句：

• The apple made a bulge in his pocket.苹果把他口袋塞得鼓了起来。
• What's that awkward bulge in your pocket?你口袋里那块鼓鼓囊囊的东西是什么？

15 disturbances   

n.骚乱( disturbance的名词复数 )；打扰；困扰；障碍

参考例句：

• The government has set up a commission of inquiry into the disturbances at the prison. 政府成立了一个委员会来调查监狱骚乱事件。
• Extra police were called in to quell the disturbances. 已调集了增援警力来平定骚乱。

16 suffocating   

a.使人窒息的

参考例句：

• After a few weeks with her parents, she felt she was suffocating.和父母呆了几个星期后，她感到自己毫无自由。
• That's better. I was suffocating in that cell of a room.这样好些了，我刚才在那个小房间里快闷死了。

17 persistent   

adj.坚持不懈的，执意的；持续的

参考例句：

• Albert had a persistent headache that lasted for three days.艾伯特连续头痛了三天。
• She felt embarrassed by his persistent attentions.他不时地向她大献殷勤，使她很难为情。

18 promptly   

adv.及时地，敏捷地

参考例句：

• He paid the money back promptly.他立即还了钱。
• She promptly seized the opportunity his absence gave her.她立即抓住了因他不在场给她创造的机会。